Locking device with associated key and blocking rib sensing

A locking device, comprising:

• a lock cylinder;
• and a matching key,
• the key having a key bit with at least one coding notch cut in on the front and a blocking rib that runs in a direction of extent of the key bit and has at least one blocking rib indentation,
• the lock cylinder having a housing with a bearing bore and a cylinder core that is mounted in the bearing bore and has a keyway for insertion of a key the cylinder core being blocked against rotation, when a key is not inserted, by at least one housing pin mounted in a housing hole,
• the housing pin projecting into a core hole of the cylinder core in which a core pin is fitted, and the housing pin being able to be brought into a release position enabling rotation of the cylinder core by entry of the core pin into the coding notch of the key inserted into the keyway, and
• the locking device having a blocking member for sensing the blocking rib indentation, the blocking member engaging, when a blocking rib indentation is not present, in a blocking recess of the bearing bore and preventing rotation of the cylinder core,
• wherein a pivot lever is mounted in the cylinder core and offset in an axial direction of the cylinder core relative to the blocking member, the pivot lever having a bearing end about which the pivot lever is pivotable, and having a sensing end which senses the blocking ribin an indentation-free region of the blocking rib, the pivot lever closing off a capturing opening for the housing pin when the blocking rib is a proper height and opening the capturing opening for capturing the housing pin after a partial rotation of the cylinder core when the blocking rib is missing.